<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>
</head>

<body>
    <div id="app">
        性：<input type="text" v-model = 'firstName'>
        名：<input type="text" v-model = 'lastName'>

        <br/>

        姓名:{{name}}

    </div>
    <script>
        Vue.config.productionTip = false;
        
        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    firstName: "",
                    lastName: "",
                }
            },
            //根据firstName lastName 计算属性
            computed:{
                name(){
                    return this.firstName + "--" + this.lastName
                }
            }
        })
    </script>
</body>

</html>